circuit default-tag (IS-IS view)

Function

The circuit default-tag command sets an administrative tag value for an interface on which IS-IS process is enabled.

The undo circuit default-tag command restores the default value.

The ipv6 circuit default-tag command sets an administrative tag for an IS-IS IPv6 interface.

The undo ipv6 circuit default-tag command restores the default value.

By default, the administrative tag value of all interfaces is 0.

By default, the administrative tag for an IS-IS IPv6 interface is 0.

Format

[ ipv6 ] circuit default-tag tag [ level-1 | level-2 ]

undo [ ipv6 ] circuit default-tag [ tag ] [ level-1 | level-2 ]

Parameters

Parameter	Description	Value
tag	Specifies the administrative tag carried in a route imported from an IPv6 interface.	The value is an integer ranging from 1 to 4294967295.
level-1	Indicates the administrative tag for a Level-1 IPv6 interface.	-
level-2	Indicates the administrative tag for a Level-2 IPv6 interface.	-

Parameter

Description

Value

tag

Specifies the administrative tag carried in a route imported from an IPv6 interface.

The value is an integer ranging from 1 to 4294967295.

level-1

Indicates the administrative tag for a Level-1 IPv6 interface.

level-2

Indicates the administrative tag for a Level-2 IPv6 interface.

Views

IS-IS view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
isis	write

Usage Guidelines

Usage Scenario

The administrative tag carries the administrative information about an IP address prefix. It is used to control the routes of different levels and routes imported from multiple areas. Administrative tags can advertise IP address prefixes in the IS-IS domain to control routes, simplifying management.

After the circuit default-tag command is run, all routes of a specified IS-IS process carry an administrative tag value. The administrative tag value can be used to filter routes as needed.

If level-1 and level-2 are not specified in the ipv6 circuit default-tag command, the ipv6 circuit default-tag command sets an administrative tag for all Level-1 and Level-2 IPv6 interfaces.

The administrative tag for an interface is advertised along with routes.

If the IS-IS cost type is narrow or narrow-compatible, the administrative tag of an interface is not advertised through an LSP.
If the IS-IS cost type is wide, wide-compatible, or compatible, the administrative tag of an interface is advertised through an LSP.
Before using the ipv6 circuit default-tag command in an IS-IS process, enable IPv6 in the IS-IS process. For details, see the isis ipv6 enable command.

Prerequisites

An IS-IS process has been started using the isis command.

Precautions

When the cost type of IS-IS is wide, wide-compatible, or compatible, the administrative tag value is advertised through an LSP. The cost type can be configured using the cost-style command.

The administrative tag value configured using the circuit default-tag command is the global administrative tag value. The interface administrative tag configured using the isis tag-value command takes precedence over the global administrative tag.

Example

# Set the administrative tag for Level-1 interfaces to 30.

<HUAWEI> system-view
[~HUAWEI] isis 1
[*HUAWEI-isis-1] circuit default-tag 30 level-1